DnD Boys, New Campaign 1: The Introduction

I'm starting a new campaign for the boys, because I kind of let the other one die of ennui. Well, that and lack of planning. This one at least has a definite direction. So here's their opening:

The city of Stalmont begins at the foot of the great mountain, and climbs the steep slopes to the Royal Citadel at the peak. Dwarves work their mines and make their homes deep in the mountain itself, while humans and elves, halflings and halfbreeds make their homes in the walled tiers of the outer city. At the foot of the mountain, the city sprawls out in a disorganized slum, cut through with the stone-paved trade roads but otherwise changing constantly. To the south, just outside the city, a cluster of gnomish burrows forms a sort of suburb. The valley floor to the south and east spreads out into the farms and orchards and small villages that supply Stalmont with food and raw materials, which the artisans and crafters convert to finished goods.To the north lie the foothills that hold vineyards and herders, and beyond them the old forest that supplies the city's timbers. A wide tunnel through the base of the mountain connects Stalmont to the docks of Tradeport, which sit on the edge of the Inland Sea.

Recently, the merchant-noble Ardivil has put out a call for adventurers willing to explore strange and possibly dangerous places. His workers, it seems, have uncovered the ruins of an ancient civilization in the caves of a nearby mountain, and he wants explorers to examine the site before he risks a full expedition. Each of you, for reasons of your own, has decided to sign up. The money is good, it's a chance to escape Stalmont, and how dangerous could a deserted city be anyway?

The boys have already created their characters. In a bit of a dramatic shift, Firstborn is playing a Paladin -- he wanted a combination of hitting things and healing. Secondborn, meanwhile, has taken over the position of Druid, mainly so he can play a wolf as well. He was very insistent about his character's origin, though: apparently he found an ancient statue, and it gave him Druid Powers. I'm throwing in a DM's character as well -- something I normally wouldn't do, except that it's hard to cover the bases with just two players. So my character will be a half-elf street rat (rogue) who will pivot to Wizard after third level. (He has a sort of mentor figure who's a mid-level wizard, who's been training him.) Beautiful Wife might join in, but I'm not really expecting that and we haven't made a character for her yet.